Oil stove



Feb. 12 1924. 1,483,088

' R. HOFFMAN v on. swova onginal Filed July 19. 1919 Patented Feb. 12, 1924.

UNMD STATES PATENT OFFICE.

RUDOLPH Horrrrnnor KANKAE, ILLINors, Ass'reivon 'ro sanas, Ros-:BUCK AND co., oF CHICAGO, ILLINOIS, A CORPORATION 0F NEW YORK.

'o'IL s'rovE.

Original application led July 19, 1919, SerialNo. 311,953.- Divided and this application led January 3, 1921. Serial No. 434,497.

T 0 all whom t may concern:

Be it known that I, RUDOLPH HOFFMAN, a citizen of the United States, residing at Kankakee, in the county of Kankakee-.and State of Illinois, have invented certain new and useful Improvements in Oil Stoves, of which. the following is a specification.

The invention relates to oil Stoves of thel type embodying a constant-level oil supply reservoir and one or more burners adapted to be raised and lowered with reference to said constant level whereby to control the' How of oilfrom the reservoir to the burners. Such burners are usually supported beneath the stove top upon a horizontal stationaryv supply pipe, andto permit of the vertical movement of the burners with reference to said pipe an extensible pipe connection is employed between the burner and supply pipe comprising two telescopingpipe sections. l

Owing to thetendency of the oil to creep along a metallic surface by capillary attrac tion, l provide a liquidmetallic seal of mercury or the like for the joint between said pipe sections, which absolutely prevents the leakage of oil. One of the objectsfof this invention is to provide means of advantageous construction to form a. closure for retaining such mercury against' escape when the stove is tipped up upon end or invert-ed as in shipping.

Another object of the invention is'to'provide improved means for effect-ing the rais ing` and lowering movements of the burner with reference to the constant oil level.

In the accompanying drawings, I have illustrated a preferred form of my invention, another form being described vand claimed in my co-pending application Serial No. 311,953, filed July 19, 1919, of which this application is a division. Fig. 1 is .a vertical sectional view taken on line 1-1 of Fig. 2.. Fig. 2 is a top plan view of the device shown in Fig. 1, but with theE burner removed.

ln the drawings 1 designatesthel bowl or trough of an oil burner mounted upon" .a stationary horizontal pipe 2 which 'receives a supply. of oil from a constantflevel oilreservoir (not shown) of well-,known construction. ,3' indicatesl generally an' extensible pipe connection between thev trough 1 and pipe 2, by means of which a supply of oil is conducted to the burner and maintained atI a constant level in a well-known manner.

The extensible connection 3 between the burner bowlor trough 1 of the burner and the vsupply or delivery pipe 2 comprises two sections 3a and 3b carried respectively by v the pipe 2 and trough 1. The inner section 3a is made of a diameter slightly less than the .diameter of the outer section 3b and at it's lower end is screw-threaded into a fitting 4 connected in a well-known manner to the delivery pipe 2 so as to communicate therewith. The pipe section 3b is rigid with the lower edge of the burner bowl 1, being securedvthereto'as by brazing, and is adapted to freely receive the section 3a.

The means for clamping the fitting 4 upon the Ldeliverypipe `1 so that it shall be capable of firmlysupporting the burner in its proper position, comprises a pair of links 5 and 6 operatively engaging with studs 7 and 8 upon oppositeA sides. of the litting and similarly connected to an interme diate block 9 below the pipe 2. Said block has a set screw 10 therein adapted to operatively enga'ge with the pipe 2. By simply tightening said screw, the fitting 4 may be drawn downwardly onto thedelivery pipe 2 and firmly clamped iny position thereon.

For the purpose of providing an annular channel around' the inner pipe section 3a 0f the extensible pipe'connection 3, for the reception of. a quantity of mercury or the like in which the lower end of the pipe section 3b may be immersed, I provide a tubular stem or member 11 carried by the fitting 4. This member is in the form of a pipe of a diameter somewhat greater than the diamet-er of the pipe section 3a and at its lower end is .threaded into a socket 12 provided in-.the upper portion of the fitting 4. The pipe section 3a and the tubular member 11 are thus concentricallyy arranged and are spaced apart to form a channel 13. Said channel vis filled with a. vsealing rliquid such aslmercury 14"y to al depth suliicient tocover thellowe'r end of the outer pip-e section 3b in all operative positionsof-.the latter relativey thereto. It'v w-.illbe seen that oil standing in` the. pipe section Stand overowing into l'the space between it andthe section 3b is prevented from flowing around-the lower end `of the'latter section b Vthe-mercury in the channel into which sai section depends.

It will be seen that the annular channel 13 formed between the stem ll and the inner pipe section 3@L is normally open in the operative position of the parts, so thatif the stove is tipped upon end or inverted, the mercury will escape from the channel unless prevented. In the present instance, to prevent such escape of the mercury the outer pipe section 3l near its upper end is provided upon its inner and outer sides with a pair of annular valve members 38 and 39 beveled at their lower ends and adapted to be seated upon correspondingly beveled edges of the inner pipe section 3ft and the stem 1l.

As a means for lockingsaid valve members in their operative or closed position at the upper end of the channel 13, a locking sleeve 40 and lock-nut 4l may be provided. with the outer valve member 38 and at its lower end is provided with an annular shoulder 42 adapted to be engaged by the lock-nut 4l, which latter is arranged to be screw-threaded onto the upper end of the fitting 4. It desired, the lock nut may be provided with a pair of radially projecting pins 43 to facilitate the manipulation thereof. Villien the parts are in position to permit the raising and lowering ofthe burner, the lock-nut rests loosely upon the upper end ot the iitting 4a, inthe position shown in full lines in Fig. S, and when it is desired to lock the valve members upon their seats it is only necessary to screw the lock-nut downwardly into the litting, into the position shown in dotted lines in said ligure. ln this latter operation itwill be seen that the valve members may be lirmly drawn downwardly upon their seats to close the upper end of the annular channel 13. 1

The raising and lowering means in the present instance, ycomprises a lever 44 pivoted between its ends onthe upper end of the locking sleeve 40 and fulcrumed at its inner or rear end upon a bracket 45 rising upwardly and rearwardly from the iitting 4. The lever 44 may comprise a pair of arms 44a bent so as to form a hand portion 44b at its forward end and to straddle the sleeve 40 (Fig. 2) rearwardly of said hand portion. A pair of oppositely extending pins 46 may be provided upon the upper end of the sleeve 40 to form a pivotal mounting for each of the arms 44a. rAt their rear ends said arms are made of substantial width, substantially1 boot-shaped, and are provided with slots 47 for receiving pivots 48 mounted upon the rear end of the bracket. Said bracket at its forward end may be fixed upon a collar 49 screw-threaded onto the fitting 4, and at its upper rear end. the bracket may be provided with a pair of upstanding lugs 50 at the opposite edges thereof for supporting the pivots 48. Said pivots may be in the form of screws having nuts IThe sleeve at its upper end is rigid' 48*L and locknuts 43h. As the hand portion 44b of the lever is raised and lowered, the lever carrying with it the burner trough l, pins 4G and the inner or rear ends o't the arms 44a move forwardly and rearwardly to the extent determined by the length of the slots 47. The lock nuts 43h serve to hold the nuts 48 properly adjusted to eiifect a frictional engagement between the relatively sliding parts whereby to retard the lowering movement of the burner.

it will be seen that l have provided in an oil stove employing mercury or the like for preventing the leakage of oil past the joint between the pipe sections of the extensible pipe connection, means of advantageous construction for retaining the liquid when the stove is inverted, as in shipment. The raising and lowering means for the burners are also advantageous, being simple in construction and easily operable to eiilect the raising and lowering movement oi1 the burners as may be desired. Claims directed to the mercury seal per se are contained in my co-pending application Serial No. 308,- 542, liled July 3, 1919.

`While I have herein illustrated and described the invention with considerable par` ticularity, l desire to have it understood that in the interpretation of the appended claims they are not to be limited except as may be necessitated by the state ot the prior art.

I claim as my invention:

l. In an oil stove, the combination with an oil supply pipe and a burner, of a )fitting mounted on said supply pipe, an extensible pipe connection between said fitting and said burner comprising an inner pipe section rising' from the litting, an outer section depending rom the burner and telescoping over the inner pipe section, a tubular stem providing an annular channel around said inner pipe section for the reception of a quantity of mercury or the like into which the lower end ot the outer pipe section is immersed, a pair of valve members upon said outer pipe section adapted to be seated upon the upper ends ot said inner pipe section, a stem to form a closure for said annular channel, a locking sleeve rigid with said outer pipe section and surrounding said stein, said sleeve having at its lower end a shoulder. a lock-nut engaging said shoulder and said ittting to draw said sleeve downwardly and clamp said valve members upon their seats, and raising and lowering means for the burner 'comprising a bracket carried by said lit-ting, and a lever tulcrumed on said bracket and pivotally connected to said locking sleeve.

2. In an oil stove, the combination with an oil supply pipe and a burner mounted for movement with reference to said pipe, of an'extensible pipe connection between said pipe and said burner comprising a pair llfi lof telescoping pipe sections, a tubular stem forming with the inner vpipe section-an annular. channel for the reception' of a metallic liquid seal into which the -lower end of the outer pipe section is adapted to be immersed, and means for closing the upper end of said channel including a valve member rigid with. the `outer pipesection and adapted to be seated upon the upper` end of said stem, a locking sleeve rigid with said outer pipe section and i surrounding said stem, a part rigid with the inner pipe section and arranged coaxially thereof, and a lock nut operatively engaging with said sleeve and said part to yclamp said valve member to its seat.

3. In an oil stove, the combination with a Aburner anda source of oil-supply, of means :for: raising and lowering theburner, .means -t'or conducting.v a supply of yoil from said source of supply-to the burner butv permitthe vertical movement .of the latter, .said

vmeans comprising a sectional :pipe havingna sliding joint, means 4providing anvannular channel around said joint for the reception `ci mercury or the like `for sealingthe oint; and means for closing saidfchannel comprisinga valve member, a partr rigid' with the supply pipe, and a lock nut operatively connected with said valve member and adapted to operatively engage'withsaidf part.

5. Inan oil stove, the combination with a burner and an oil supply pipe, of means for conducting a supply of oil from said pipe to said burner but' permitting of a vertical movement of the latter, said 'means comprising a sectional pipel havingfa sliding joint, means 'providing a' chamber 'open at its -upper end `for the reception of mercury adapted to seal said joint, and -means fork closing saidcha-mber comprisinga valve member,a

Vlocking sleeve rigid withsaidvalve member andsurrounding said sectional pipe, a. stationarypart and a lock-nut for connecting said sleeve tosaid stationary part whereby toclamp said valve member upon its seat.

6. In" an oil` stove, the combination' with. a

'vertically `movable burner andan oilssupplyk pipe, of anlextensiblewpipe connectionfb'etween said burner and supply l lp-ipe Yincluding a pair of relatively slidable pipe sections, an :upright bracket, 'a member rigid with said burner, and guided `by said extensible pipe for vertical movement with .the burner, and a lever fulcrumed on VVsaid bracket and pivoted between its ends to said vertically movable member.

7. In an oil stove, the combination with an oil supplyrpi'pe and a burner, of means for .conducting a supply ot' oil to said burner but-permitting of the vertical movement of thelatter, and raising andv lowering means for the yburner comprising a bracket, a part depending from the burner and rigid therewith, and a lever pivotally connected between its ends to said` pendant part of the burner and'fulcrumed on'said bracket.

In'an oil. stove, the combi'nationwith a burner and an oil supply pipe, of an eX- tensible pipe connection between said burner and-saidpipe comprising a'lpairof telescopmg pipe sections, a stationary upright bracket having a pivot at its upper end, and

. a lever pivotally connected with said burner and having a slot at itsy free end inwhich the pivot on' said bracketslidably engages.

9. In an oil'stove, the combination with Van oil supply pipe and a burner of a fitting mounted on said pipe, an extensible pipe connection between said fitting and said burner comprising an inner pipe section-rising from the tting and an outer telescoping` pipe section depending from the burner, and means for raising and lowering the burner comprising a hand lever pivotally mounted with reference to said fitting and pivotally connected between its ends with said burner.

'10. lIn an oil stove, the combination with an oil supplyvpipe and a burner, of an eX- tensiblepipe connection between said supply pipe and said burner comprising a pair of ytelescoping pipe sections, an upwardly and rearwardly inclined kbracket supported by said supply pipe,and a hand lever pivotally i mounted on-said bracket and extending forwardly for connection with said burner.

f`1l. In an oil stove, the combination with an oil supply pipel and a burner,`of an eX- tensible pipe connection between said supply `pipe .and said burner comprising a pair of i telescopingy pipe sections, a stationary bracket, a lever pivotally mounted onsaid bracket, a part rigid with said burner and having the lever pivotally connected therewith-whereby van operation of the lever will raise rand lower therburner, and means carried' bytherbrac'ketf adapted to frictionally engage the .lever to :retard the lowering movement fof* the burner. 5

12.-In.an oil stove, the combination with pipe to the burner, said raising 'and lowering means comprising a bracket mounted upon the supply pipe and projecting rearwardly and upwardly from its support, and a hand lever pivotally mounted on the bracket to swing in a vertical plane and having a forwardly extending portion operatively connected with the burner.

13. ln an oil stove, the combination with an oil supply pipe, of a burner mounted for movement up and down with reference to said pipe, and means for raising and lowering the burner comprising a -bracket mounted upon the pipe and a lever pivotally mounted with reference to the burner and fulcrumed on said bracket, said lever being movable longitudinally relative to its fulcrumed pivot.

14. In an oil stove, the combination with an oil supply pipe and a burner, of means for conducting a supply of oil to the burner but permitting a raising and lowering thereof, and means for effecting such raising and lowering movements comprising a lever, a stationary bracket upon which said lever is fulcrumed to swing on a horizontal axis, and means pivotally connecting the lever between its ends with the burner.

15. ln an oil stove, the combination with an oil supply pipe and a burner, of means for raising and lowering the burner relative to said pipe, and means for conducting a supply of oil from the pipe to the burner, said raising and lowering means comprising a lever pivotally connected with said burner, a stationary bracket having a pivot, said lever having a slot for receiving said pivot, and means for frictionally engaging the lever on its opposite sides, to retard 4the lowering movement of the burner.

16. In an oil stove, the combination of a burner and an oil supply pipe, means for conducting a supply of oil from said pipe t0 said burner comprising a sectional pipe having a sliding joint, means providing a chamber open at its upper end for the reception of mercury adapted to seal said joint, a part rigid with the burner, a bracket fixed with reference to said supply pipe, a lever fulcrumed on said bracket and pivoted to said part on the burner, valve means carried by said lbracket operable in the movements of' the burner into engagementwith the upper end of said chamber so as to close it, and means for locking said valve means in its closed position.

17. 1n an oil stove, the combination of a burner and an oil supply pipe, means for conducting a supply of oil fromsaid pipe to said burner comprising a sectional pipe having` a sliding joint, means providing a cham- .her open at its upper end for the reception of mercury adapted to seal said joint, a part rigid with the burner, a bracket fixed with reference to said supply pipe, a lever fulcrumed on said 'bracket and pivoted to Said part on the burner, valve means carried by said bracket operable in the movements of the burner into engagement with the upper end of said chamber so as to close it, and means :for locking said valve meansk in its closed position, the last mentioned means comprising a lock-nut adapted to operatively engage said depending part of the burner and having a screw-threaded engage ment with a stationary part on the supply pipe.

18. In an oil stove, the combination of an oil supply pipe, a burner, an extensible connection between said pipe and said burner permitting of the up and down movements of the latter and comprising a pair of telescoping pipe sections, means providing an annular chamber for the reception of a quantity of mercury or the like in which the free end of the outer pipe section is adapted to be immersed, means for raising and lowering the burner, valve means adapted to close the upper end of said channel, and means independent of the raising and lowering means for locking said valve means in closed position.

19. The combination of a supply pipe, a burner, an extensible connection between said pipe and burner comprising a pair of telescoping pipe sections, means providing an annular channel for the reception of a quantity of mercury into which the free end of the outer one of said pipe sections is adapted to be immersed, valve means for closing the upper end of said channel, a sleeve rigid with said valve means and surrounding said extensible connection, and means including a nut loose on said sleeve to clamp said valve means in its closed position.

20. The combination of an oil supply pipe having a fitting thereon, a burner, an extensible pipe connection between said fitting and said burner, means providing a metallic liquid seal for the extensible pipe connection including a chamber open at its upper end, valve means for closing said chamber, a member fixed with reference to said valve means, and a lock-nut adapted slidably to engage said member to secure it to said fitting and thereby said valve means in its closed position.

21. In an oil stove, the combination of a burner, means including an extensible pipe connection for conducting a supply of oil to the burner, means for raising and lowering the burner as permited by said pipe connection, and means independent of the raising and lowering means for locking the burner in its lowermost position.

22. Inv an oil stove, the combination with an oil supply pipe and a burner, of means for conducting a supply of oil to the burner but permitting the raising and lowering thereof, and means for effecting such raising and lowering movements comprising ak stationary bracket, a lever operatively connected with said burner and with said bracket, and means at the rear end of said lever adapted to engage frictionally therewith so as to retard the lowering movement of the burner.

23. In an oil stove, the combination with an oil supply pipe and a burner, of means for conducting a supply of oil to the burner but permitting the raising and lowering thereof, and means for eiiecting such raising and lowering movements comprising a stationary bracket and a lever operatively connected with the burner and with said bracket, one of said operative connections including a slot and pivot andmeans for retarding the lowering movements of the burner.

24. In an oil stove, the combination with an oil supply pipe and a burner, of means for conducting a supply of oil to the burner but permitting the raising and lowering c thereof, and means for effecting such raising and lowering movements comprising a stationary support and a lever operatively connected with the burner and with the support, one end of said lever being bifurcated to form spaced arms, and means frictionally engaging with said arms whereby to retard the lowering movements of the burner.

25. In an oil stove, the combination of a burner, and means for raising and lowering the burner including a bracket having a pair of lugs spaced apart, and a lever operatively connected with said bracket and having arms frictionally engaging with said lugs whereby to retard relative movement between the lever and said bracket.

In testimony whereof I have hereunto set my hand.

RUDOLPH HOFFMAN. 

